Last week the world reached a grim milestone: Levels of atmospheric carbon dioxide passed 400 parts per million for the first time in human history[1]. It’s widely understood that this is the result of human carbon dioxide emissions. But did you know that without the help of the oceans, plants and soils this figure would already be well above 500 ppm? By analyzing where our carbon emissions[2] come from and where they go we know that less than half of human emissions since the industrial revolution remain in the atmosphere. Although they don’t get much press we should all be thankful to these wonderful carbon sinks. Without them things would be even worse. Learn more at Shrink That Footprint[2].